I've been reading lots of comments/questions about this, so I'm posting GossipCop 's take on the matter.

“Robert Pattinson and Kristen Stewart: Forbidden To Be Together In Public,” reads the headline of a story from HollywoodLife. According to the webloid, “Rob was noticeably absent” from the premiere of Paul McCartney’s new music video, “My Valentine,” which Stewart attended, “but it wasn’t because [Pattinson] didn’t want to be there.”

The facts-challenged site reports that Pattinson and Stewart “have a clause in their Twilight contracts that they can only appear together at a Twilight themed red carpet together. Twilight kind of owns some of their appearances they do together until Breaking Dawn is 100% completed.”

“It’s too bad work is keeping the couple from going out together,” chimes in the bad blog, adding, “but we totally understand!”

Unfortunately, HollywoodLife understands virtually nothing. The claims that Pattinson and Stewart “have a clause in their Twilight contracts that they can only appear together at a Twilight themed red carpet together” is 100 percent nonsense and patently untrue.

The couple simply doesn’t market their private relationship publicly on red carpets. “There is no such agreement,” confirms a source involved in Twilight to Gossip Cop.
__________HL immediately made a follow-up post to give way toTed's 'Rob-Kristen-Jules' storyOh well. lol. Maybe more stories for GC to straighten up or we'll just wait-and-see.